Table 1: Sensitivity and regression parameters.

ParameterMethod AMethod B

, nm760760
Color stability, min60 90
Linear range, g mL−10.5–10.00.2–3.0
Molar absorptivity ( ), L mol−1 cm−11.12 × 1044.55 × 104
Sandell sensitivity*, g cm−20.01230.003
Limit of detection (LOD), g mL−1 0.030.14
Limit of quantification (LOQ), g mL−10.090.42
Regression equation,
 Intercept ( )0.01310.0198
 Slope ( )0.09050.3176
 Standard deviation of ( )9.98 × 10−29.98 × 10−2
 Standard deviation of ( )1.24 × 10−23.98 × 10−2
 Regression coefficient ( )0.99710.9979

Limit of determination as the weight in g mL−1 of solution, which corresponds to an absorbance of measured in a cuvette of cross-sectional area 1 cm2 and  cm.
, where is the absorbance, is concentration in µg mL−1, is intercept, and is slope.